When the concept of power grids was developed in the 1950s, 60s and 70s, the energy universe was less complex. Power consumption was volatile, but generation in combination with a control reserve was predictable. Today, thanks to renewable power supply, generators are also prone to fluctuations. In addition, due to the electrification of other branches of industry – most notably mobility – future grids will have to transport many more times this at the high end. Since grids cannot simply be expanded as desired, new approaches to grid management and intelligent equipment are needed. This transition is already in full swing, and also places high demands on transformer manufacturers.